Thread: neck die may not be sufficient??

In the early stages of load development for my Sendero 7mm Mag.
First Norma brass I full length sized, went to the range and used them.
Now they're fire formed it's my understanding I only need to neck size. I do this only to find the projectiles go in alot easier than the first time. That worries me that the velocity/POI will be affected.
So I measure unused case neck outside 7.86mm inside 7.09mm
Fire formed and neck sized ones neck outside 7.92mm inside 7.14mm. About 0.05mm difference
Projectile (162gr Hornady SST) diameter is 7.18mm
Stem of neck sizer is 7.14mm
As this gun is for LR I'm thinking this is critical.
A)Is it fine like this and don't need to do squat.
B)Put the stem in a drill and sand it down 0.05mm